Oxidation Number
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CHXI08:REDOX REACTIONS

315210 Oxidation state of ' \(\mathrm{\mathrm{S}}\) ' in \(\mathrm{\mathrm{S}_{8}}\) molecule is

1 0
2 +2
3 +4
4 +6
CHXI08:REDOX REACTIONS

315139 Consider the following equation, which represents a reaction in the extraction of chromium from its ore
\(2 \mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{Cr}_{2} \mathrm{O}_{3}+4 \mathrm{Na}_{2} \mathrm{CO}_{3}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}+\)
\(4 \mathrm{Na}_{2} \mathrm{CrO}_{4}+4 \mathrm{CO}_{2}\)
Which one of the following statements about the oxidation states of the substances is correct?

1 The iron has been reduced from +3 to +2 state.
2 The chromium has been oxidised from +3 to +6 state.
3 The carbon has been oxidised from +2 to +4 state.
4 There is no change in the oxidation state of the substances in the reaction.
CHXI08:REDOX REACTIONS

315140 In which of the following reactions, the underlined element has decreased its oxidation number during the reaction?

1 \(\underline {{\rm{Fe}}} {\rm{ + CuS}}{{\rm{O}}_{\rm{4}}} \to {\rm{Cu + FeS}}{{\rm{O}}_{\rm{4}}}\)
2 \(\underline {{{\rm{H}}_2}} {\rm{ + C}}{{\rm{l}}_{\rm{2}}} \to {\rm{2HCl}}\)
3 \(\underline {\rm{C}} {\rm{ + }}{{\rm{H}}_{\rm{2}}}{\rm{O}} \to {\rm{CO + }}{{\rm{H}}_{\rm{2}}}\)
4 \(\underline {{\rm{Mn}}} {{\rm{O}}_{\rm{2}}}{\rm{ + 4HCl}} \to {\rm{MnC}}{{\rm{l}}_{\rm{2}}}{\rm{ + C}}{{\rm{l}}_{\rm{2}}}{\rm{ + 2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXI08:REDOX REACTIONS

315141 Which of the following oxidation state is the most common among the lanthanides?

1 4
2 2
3 5
4 3
CHXI08:REDOX REACTIONS

315142 Assertion :
Oxidation state of nitrogen in \(\mathrm{N}_{3} \mathrm{H}\) is \(-1 / 3\).
Reason :
Nitrogen is less electronegative than hydrogen.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXI08:REDOX REACTIONS

315210 Oxidation state of ' \(\mathrm{\mathrm{S}}\) ' in \(\mathrm{\mathrm{S}_{8}}\) molecule is

1 0
2 +2
3 +4
4 +6
CHXI08:REDOX REACTIONS

315139 Consider the following equation, which represents a reaction in the extraction of chromium from its ore
\(2 \mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{Cr}_{2} \mathrm{O}_{3}+4 \mathrm{Na}_{2} \mathrm{CO}_{3}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}+\)
\(4 \mathrm{Na}_{2} \mathrm{CrO}_{4}+4 \mathrm{CO}_{2}\)
Which one of the following statements about the oxidation states of the substances is correct?

1 The iron has been reduced from +3 to +2 state.
2 The chromium has been oxidised from +3 to +6 state.
3 The carbon has been oxidised from +2 to +4 state.
4 There is no change in the oxidation state of the substances in the reaction.
CHXI08:REDOX REACTIONS

315140 In which of the following reactions, the underlined element has decreased its oxidation number during the reaction?

1 \(\underline {{\rm{Fe}}} {\rm{ + CuS}}{{\rm{O}}_{\rm{4}}} \to {\rm{Cu + FeS}}{{\rm{O}}_{\rm{4}}}\)
2 \(\underline {{{\rm{H}}_2}} {\rm{ + C}}{{\rm{l}}_{\rm{2}}} \to {\rm{2HCl}}\)
3 \(\underline {\rm{C}} {\rm{ + }}{{\rm{H}}_{\rm{2}}}{\rm{O}} \to {\rm{CO + }}{{\rm{H}}_{\rm{2}}}\)
4 \(\underline {{\rm{Mn}}} {{\rm{O}}_{\rm{2}}}{\rm{ + 4HCl}} \to {\rm{MnC}}{{\rm{l}}_{\rm{2}}}{\rm{ + C}}{{\rm{l}}_{\rm{2}}}{\rm{ + 2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXI08:REDOX REACTIONS

315141 Which of the following oxidation state is the most common among the lanthanides?

1 4
2 2
3 5
4 3
CHXI08:REDOX REACTIONS

315142 Assertion :
Oxidation state of nitrogen in \(\mathrm{N}_{3} \mathrm{H}\) is \(-1 / 3\).
Reason :
Nitrogen is less electronegative than hydrogen.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXI08:REDOX REACTIONS

315210 Oxidation state of ' \(\mathrm{\mathrm{S}}\) ' in \(\mathrm{\mathrm{S}_{8}}\) molecule is

1 0
2 +2
3 +4
4 +6
CHXI08:REDOX REACTIONS

315139 Consider the following equation, which represents a reaction in the extraction of chromium from its ore
\(2 \mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{Cr}_{2} \mathrm{O}_{3}+4 \mathrm{Na}_{2} \mathrm{CO}_{3}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}+\)
\(4 \mathrm{Na}_{2} \mathrm{CrO}_{4}+4 \mathrm{CO}_{2}\)
Which one of the following statements about the oxidation states of the substances is correct?

1 The iron has been reduced from +3 to +2 state.
2 The chromium has been oxidised from +3 to +6 state.
3 The carbon has been oxidised from +2 to +4 state.
4 There is no change in the oxidation state of the substances in the reaction.
CHXI08:REDOX REACTIONS

315140 In which of the following reactions, the underlined element has decreased its oxidation number during the reaction?

1 \(\underline {{\rm{Fe}}} {\rm{ + CuS}}{{\rm{O}}_{\rm{4}}} \to {\rm{Cu + FeS}}{{\rm{O}}_{\rm{4}}}\)
2 \(\underline {{{\rm{H}}_2}} {\rm{ + C}}{{\rm{l}}_{\rm{2}}} \to {\rm{2HCl}}\)
3 \(\underline {\rm{C}} {\rm{ + }}{{\rm{H}}_{\rm{2}}}{\rm{O}} \to {\rm{CO + }}{{\rm{H}}_{\rm{2}}}\)
4 \(\underline {{\rm{Mn}}} {{\rm{O}}_{\rm{2}}}{\rm{ + 4HCl}} \to {\rm{MnC}}{{\rm{l}}_{\rm{2}}}{\rm{ + C}}{{\rm{l}}_{\rm{2}}}{\rm{ + 2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXI08:REDOX REACTIONS

315141 Which of the following oxidation state is the most common among the lanthanides?

1 4
2 2
3 5
4 3
CHXI08:REDOX REACTIONS

315142 Assertion :
Oxidation state of nitrogen in \(\mathrm{N}_{3} \mathrm{H}\) is \(-1 / 3\).
Reason :
Nitrogen is less electronegative than hydrogen.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXI08:REDOX REACTIONS

315210 Oxidation state of ' \(\mathrm{\mathrm{S}}\) ' in \(\mathrm{\mathrm{S}_{8}}\) molecule is

1 0
2 +2
3 +4
4 +6
CHXI08:REDOX REACTIONS

315139 Consider the following equation, which represents a reaction in the extraction of chromium from its ore
\(2 \mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{Cr}_{2} \mathrm{O}_{3}+4 \mathrm{Na}_{2} \mathrm{CO}_{3}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}+\)
\(4 \mathrm{Na}_{2} \mathrm{CrO}_{4}+4 \mathrm{CO}_{2}\)
Which one of the following statements about the oxidation states of the substances is correct?

1 The iron has been reduced from +3 to +2 state.
2 The chromium has been oxidised from +3 to +6 state.
3 The carbon has been oxidised from +2 to +4 state.
4 There is no change in the oxidation state of the substances in the reaction.
CHXI08:REDOX REACTIONS

315140 In which of the following reactions, the underlined element has decreased its oxidation number during the reaction?

1 \(\underline {{\rm{Fe}}} {\rm{ + CuS}}{{\rm{O}}_{\rm{4}}} \to {\rm{Cu + FeS}}{{\rm{O}}_{\rm{4}}}\)
2 \(\underline {{{\rm{H}}_2}} {\rm{ + C}}{{\rm{l}}_{\rm{2}}} \to {\rm{2HCl}}\)
3 \(\underline {\rm{C}} {\rm{ + }}{{\rm{H}}_{\rm{2}}}{\rm{O}} \to {\rm{CO + }}{{\rm{H}}_{\rm{2}}}\)
4 \(\underline {{\rm{Mn}}} {{\rm{O}}_{\rm{2}}}{\rm{ + 4HCl}} \to {\rm{MnC}}{{\rm{l}}_{\rm{2}}}{\rm{ + C}}{{\rm{l}}_{\rm{2}}}{\rm{ + 2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXI08:REDOX REACTIONS

315141 Which of the following oxidation state is the most common among the lanthanides?

1 4
2 2
3 5
4 3
CHXI08:REDOX REACTIONS

315142 Assertion :
Oxidation state of nitrogen in \(\mathrm{N}_{3} \mathrm{H}\) is \(-1 / 3\).
Reason :
Nitrogen is less electronegative than hydrogen.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXI08:REDOX REACTIONS

315210 Oxidation state of ' \(\mathrm{\mathrm{S}}\) ' in \(\mathrm{\mathrm{S}_{8}}\) molecule is

1 0
2 +2
3 +4
4 +6
CHXI08:REDOX REACTIONS

315139 Consider the following equation, which represents a reaction in the extraction of chromium from its ore
\(2 \mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{Cr}_{2} \mathrm{O}_{3}+4 \mathrm{Na}_{2} \mathrm{CO}_{3}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}+\)
\(4 \mathrm{Na}_{2} \mathrm{CrO}_{4}+4 \mathrm{CO}_{2}\)
Which one of the following statements about the oxidation states of the substances is correct?

1 The iron has been reduced from +3 to +2 state.
2 The chromium has been oxidised from +3 to +6 state.
3 The carbon has been oxidised from +2 to +4 state.
4 There is no change in the oxidation state of the substances in the reaction.
CHXI08:REDOX REACTIONS

315140 In which of the following reactions, the underlined element has decreased its oxidation number during the reaction?

1 \(\underline {{\rm{Fe}}} {\rm{ + CuS}}{{\rm{O}}_{\rm{4}}} \to {\rm{Cu + FeS}}{{\rm{O}}_{\rm{4}}}\)
2 \(\underline {{{\rm{H}}_2}} {\rm{ + C}}{{\rm{l}}_{\rm{2}}} \to {\rm{2HCl}}\)
3 \(\underline {\rm{C}} {\rm{ + }}{{\rm{H}}_{\rm{2}}}{\rm{O}} \to {\rm{CO + }}{{\rm{H}}_{\rm{2}}}\)
4 \(\underline {{\rm{Mn}}} {{\rm{O}}_{\rm{2}}}{\rm{ + 4HCl}} \to {\rm{MnC}}{{\rm{l}}_{\rm{2}}}{\rm{ + C}}{{\rm{l}}_{\rm{2}}}{\rm{ + 2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXI08:REDOX REACTIONS

315141 Which of the following oxidation state is the most common among the lanthanides?

1 4
2 2
3 5
4 3
CHXI08:REDOX REACTIONS

315142 Assertion :
Oxidation state of nitrogen in \(\mathrm{N}_{3} \mathrm{H}\) is \(-1 / 3\).
Reason :
Nitrogen is less electronegative than hydrogen.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.